Difference between a Intel 2.8GHZ Core i7 & 1.86GHz Core i7-840QM Quad Core?

[CBS]

Is there much difference between a 2.8GHZ Core i7 processor, which features two processor cores on a single chip (featuring a 4MB L3 cache and Turbo Boost speeds up to 3.46GHz), and a Intel Core i7-840QM Quad Core processor (1.86GHz, 8MB L3 Cache) with Turbo Boost up to 3.2GHz?

http://store.apple.com/us/configure/MC024LL/A?mco=MTc0Njg1NzI

http://www.shopping.hp.com/webapp/series/category/notebooks/ENVY173D_series/3/computer_store

 

[David Saraceno]

For what purpose? Rendering speed, encoding, etc?

 

[CBS]

For what purpose? Rendering speed, encoding, etc?

1080p24 editing and grading. I mean, real time, as much as possible.